Supreme Court to Revisit IQ Rule in Death-Penalty Cases

WASHINGTON—The Supreme Court will consider on Monday whether Florida's bright-line rule for determining which defendants are "mentally retarded" and thus ineligible for the death penalty violates the Constitution.

Florida, which ranked second, after Texas, in the number of executions last year, allows anyone with an IQ above 70 to be executed. The case being argued was brought by a condemned inmate whose lowest relevant IQ...